Modern half sovereigns, from 1817 onwards, have a diameter of 19.30 mm, a thickness of 0.99 mm, a weight of 3.99 g, are made of 22 carat (916? %) crown gold alloy, and contain 0.1176 troy ounces (3.6575 g) of gold. The reverse side, featuring St. George slaying a dragon was designed by Benedetto Pistrucci, whose initials appear to the right of the date